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Investigating the Bioavailability of Broccoli Extract Supplements

Who can join

Ages 18 to 60 · All sexes · Healthy volunteers welcome

Inclusion Criteria:

* Healthy adults, 18-60 years of age
* Willing to stop taking herbal and phytochemical (plant-based extract or phytochemical) supplements for 1 week prior to and during each study cycle
* Willing to stop cruciferous vegetable intake 1 week prior to and during each study cycle
* Must be able to give written informed consent

Exclusion Criteria:

* Body Mass Index (BMI) \<18.5 or \>30.0 kg/m2
* Tobacco use, including e-cigarettes, or smoking of any substance (e.g. cannabis) in the past three months
* Pregnancy, breastfeeding, or planning to become pregnant before completing the study
* Engaging in vigorous exercise more than 7 hours per week
* Have a significant acute or chronic illness such as cardiovascular disease, kidney or liver disease, diabetes, thyroid disorder, or radiation or chemotherapy treatment for cancer within the past five years
* Use of medications to control cholesterol (e.g. statins, cholestyramine) or fat absorption (e.g. orlistat)
* Have had bariatric surgery (e.g. gastric bypass, gastric banding, sleeve gastrectomy, etc.), other gastrointestinal procedure (e.g. cholecystectomy) or disorders (e.g. Crohn's disease, celiac disease, ulcerative colitis)
* Allergic to broccoli, moringa, mustard, or maitake mushrooms
* Weighs less than 110 pounds
* Diagnosis of sickle cell disease

About the study

The goal of this clinical trial is to compare how much glucoraphanin and sulforaphane from 3 different versions of broccoli extract supplements is absorbed into the body and excreted in urine. This study involves generally healthy adults age 18-60 years. The supplements contain glucoraphanin and myrosinase enzyme, both naturally occurring in cruciferous vegetables. Once ingested, glucoraphanin is converted to the bioactive compound sulforaphane, which is thought to have numerous health benefits, including cancer prevention.

Participants will:

* consume 3 different versions of broccoli extract supplements (glucoraphanin will range from 35-70 mg) * complete 3 separate 24 hour study cycles * submit blood and urine samples for 24 hours * follow diet restrictions (no cruciferous vegetables or condiments or phytochemical/herbal supplements for 1 week prior to and during each study cycle)

What is being tested

• Avmacol Extra Strength with coating - 1 tablet (dietary supplement)
• Avmacol chewable wafer - 2 tablets (dietary supplement)
• Avmacol Extra Strength with coating - 2 tablets (dietary supplement)

Sponsor: Oregon State University · Participants: 12 · Started: Aug 4, 2026

Contact the study team

• Emily Ho, PhD · Phone: 541-737-9559
• Sandra Uesugi, RN, BSN, MS · Phone: 541-737-3594

Official record on ClinicalTrials.gov — NCT07564674

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.